Seems like a good price, especially for a faster charge with quick charge enabled devices, where it supports up to 15W. It won't support faster charging than 5W with iPhone but for me that's all I need as its a spare to have at my desk. The product page also states that as the micro USB is quite short (2ft) you can contact RavPower for a longer cable, I'm assuming for free. Deal ends today.

Use code: AKY8YDPS for discount from £14.99

Edit: Seems as if getting sent a longer cable is as simple as sending the seller a message. Reviews state that they were sent out a 5 pack of micro USB cables. Looking at the cables RavPower sell it may be the 5 pack of 1ft, 3ftx2, 6ft and 10ft. I have messaged them and will update when they reply.